This medical illustration diagram accurately depicts neurons (brain cells) before and after an axonal shearing injury, or post-concussion syndrome. The first illustration pictures a normal neuron with labels for the nerve cell body, Nissl bodies, nucleus, neuroglial cells, axon, dendrites, myelin sheath and axon terminal. The second illustration depicts trauma causing twisting and tearing of the neuronal axon. The third illustration shows the post-trauma condition with death of the brain cell.